Suggestion about Java observer based event handling

import java.util.Observable;

public interface ILinkableComponent extends IDescribable, IIdentifiable {

  // .... other ILinkableComponent methods

  // Observable for status changed events, use to add (and remove) Observers.
  // Will call Observer.update(Observable o, Object arg), with arg of type
  // LinkableComponentEventArgs.
  public Observable getStatusChangedObservable();

  // Observable for exchange item value changed events, use to add (and remove)
  // Observers (Observer is a base class in Java). Will call Observer.update(
  // Observable o, Object arg), with arg of type ExchangeItemEventArgs.
  public Observable getExchangeItemValueChangedObservable();

}